/* ===== 品牌与团队 / page-about ===== */

.page-about {
  --about-rail-w: 60px;
  --about-pad: 16px;
  position: relative;
  overflow-x: clip;
  padding: 0 0 76px;
  background-color: var(--lt-felt);
  color: var(--lt-ivory);
  font-family: var(--lt-sans);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(45deg, rgba(201, 162, 39, 0.045) 0 1px, transparent 1px 7px),
    repeating-linear-gradient(-45deg, rgba(53, 210, 224, 0.025) 0 1px, transparent 1px 11px);
}

.page-about > * {
  position: relative;
  z-index: 1;
}

.page-about a {
  text-decoration: none;
}

/* ---------- 面包屑 ---------- */

.page-about .lt-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 26px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--lt-mist);
}

.page-about .lt-crumb:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: rgba(201, 162, 39, 0.6);
}

.page-about a.lt-crumb {
  color: var(--lt-gold-soft);
  border-bottom: 1px solid rgba(201, 162, 39, 0.35);
}

.page-about a.lt-crumb:hover {
  color: var(--lt-cyan);
  border-bottom-color: var(--lt-cyan);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: 26px 0 0;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .lt-anchor {
  display: inline-block;
  margin: 0 0 16px;
  padding: 3px 10px;
  border: 1px solid rgba(201, 162, 39, 0.55);
  font-family: var(--lt-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--lt-gold);
}

.page-about h1 {
  margin: 0 0 18px;
  font-family: var(--lt-serif);
  font-weight: 900;
  font-size: 32px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--lt-ivory);
}

.page-about .lt-lede {
  max-width: 60ch;
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--lt-mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.page-about .lt-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  font-size: 14px;
  letter-spacing: 0.04em;
  border: 2px solid transparent;
  transition: transform 0.18s var(--lt-ease), background-color 0.18s var(--lt-ease), border-color 0.18s var(--lt-ease), color 0.18s var(--lt-ease);
}

.page-about .lt-btn--primary {
  background: var(--lt-red);
  border-color: var(--lt-red);
  color: var(--lt-ivory);
  box-shadow: 5px 5px 0 0 rgba(5, 16, 12, 0.85);
}

.page-about .lt-btn--primary:hover {
  transform: translateY(-3px);
}

.page-about .lt-btn--ghost {
  border-color: rgba(201, 162, 39, 0.7);
  color: var(--lt-gold-soft);
  background: transparent;
}

.page-about .lt-btn--ghost:hover {
  border-color: var(--lt-cyan);
  color: var(--lt-cyan);
  transform: translateY(-3px);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid rgba(201, 162, 39, 0.3);
  background: rgba(201, 162, 39, 0.28);
}

.page-about .about-hero__facts > div {
  padding: 14px 16px;
  background: var(--lt-felt);
}

.page-about .about-hero__facts dt {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--lt-mist);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-family: var(--lt-mono);
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--lt-gold-soft);
}

/* ---------- 图位通用 ---------- */

.page-about .lt-media {
  position: relative;
  margin: 0;
  border: 2px solid rgba(201, 162, 39, 0.6);
  background: var(--lt-felt-2);
  box-shadow: var(--lt-hard);
  overflow: hidden;
}

.page-about .lt-media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .lt-media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 22px 12px 9px;
  font-family: var(--lt-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--lt-gold-soft);
  background: linear-gradient(180deg, rgba(5, 16, 12, 0) 0%, rgba(5, 16, 12, 0.92) 70%);
}

.page-about .about-hero__figure {
  aspect-ratio: 3 / 2;
}

.page-about .about-flow__figure {
  aspect-ratio: 1 / 1;
}

.page-about .about-service__figure {
  aspect-ratio: 10 / 7;
}

/* ---------- 章节骨架与时间轴 ---------- */

.page-about .about-chapters {
  padding-top: 54px;
}

.page-about .about-chapter {
  padding: 0 0 50px;
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-chapter__rail {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.page-about .about-chapter__rail::before {
  content: "";
  position: absolute;
  left: calc(50% - 1px);
  top: 30px;
  bottom: -50px;
  width: 2px;
  background: linear-gradient(180deg, rgba(201, 162, 39, 0.55) 0%, rgba(201, 162, 39, 0.08) 100%);
}

.page-about .about-chapter:last-child .about-chapter__rail::before {
  display: none;
}

.page-about .about-node {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border: 2px solid var(--lt-gold);
  border-radius: 2px;
  background: var(--lt-felt);
  color: var(--lt-gold-soft);
  font-size: 9px;
  letter-spacing: 0;
}

.page-about .about-chapter__body {
  min-width: 0;
}

.page-about .lt-eyebrow {
  margin: 0 0 6px;
  font-family: var(--lt-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--lt-gold);
}

.page-about .about-chapter__body h2 {
  margin: 0 0 16px;
  font-family: var(--lt-serif);
  font-weight: 800;
  font-size: 23px;
  line-height: 1.32;
  color: var(--lt-ivory);
}

.page-about .about-chapter__body p {
  margin: 0 0 15px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--lt-mist);
}

.page-about .about-chapter__body strong {
  color: var(--lt-ivory);
  font-weight: 600;
}

.page-about .lt-note {
  margin: 4px 0 0;
  padding: 12px 0 12px 16px;
  border-left: 3px solid rgba(201, 162, 39, 0.55);
  background: rgba(18, 46, 38, 0.55);
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--lt-mist);
}

/* ---------- 职能矩阵 ---------- */

.page-about .about-roles {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
}

.page-about .about-role {
  border: 2px solid rgba(201, 162, 39, 0.42);
  background: var(--lt-felt-2);
  box-shadow: 4px 4px 0 0 rgba(5, 16, 12, 0.72);
  transition: border-color 0.18s var(--lt-ease), transform 0.18s var(--lt-ease);
}

.page-about .about-role:hover {
  border-color: var(--lt-cyan);
  transform: translateY(-2px);
}

.page-about .about-role__heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-about .about-role__trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-role__trigger:focus-visible {
  outline: 2px solid var(--lt-cyan);
  outline-offset: -4px;
}

.page-about .about-role__count {
  flex: none;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--lt-gold-soft);
  color: var(--lt-black);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about .about-role__name {
  flex: 1 1 auto;
  font-family: var(--lt-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--lt-ivory);
}

.page-about .about-role__mark {
  flex: none;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--lt-gold);
  border-bottom: 2px solid var(--lt-gold);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.2s var(--lt-ease), border-color 0.2s var(--lt-ease);
}

.page-about .about-role__trigger[aria-expanded="true"] .about-role__mark {
  transform: rotate(225deg) translate(0, 0);
  border-color: var(--lt-cyan);
}

.page-about .lt-accordion__panel {
  padding: 0 16px 16px;
  border-top: 1px solid rgba(201, 162, 39, 0.28);
}

.page-about .lt-accordion__panel p {
  margin: 13px 0 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--lt-mist);
}

.page-about .about-role__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.page-about .about-role__meta span {
  padding: 2px 8px;
  border: 1px solid rgba(53, 210, 224, 0.4);
  font-family: var(--lt-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--lt-cyan);
}

/* ---------- 流程 ---------- */

.page-about .about-flow {
  display: grid;
  gap: 26px;
  margin: 24px 0 0;
}

.page-about .about-flow__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: about-flow;
}

.page-about .about-flow__steps li {
  position: relative;
  padding: 0 0 26px 52px;
  counter-increment: about-flow;
}

.page-about .about-flow__steps li::before {
  content: "0" counter(about-flow);
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 2px solid var(--lt-gold);
  background: var(--lt-felt-2);
  font-family: var(--lt-mono);
  font-size: 13px;
  color: var(--lt-gold-soft);
}

.page-about .about-flow__steps li::after {
  content: "";
  position: absolute;
  left: 16px;
  top: 38px;
  bottom: 6px;
  width: 2px;
  background: rgba(201, 162, 39, 0.28);
}

.page-about .about-flow__steps li:last-child::after {
  display: none;
}

.page-about .about-flow__steps h3 {
  margin: 4px 0 8px;
  font-family: var(--lt-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--lt-ivory);
}

.page-about .about-flow__steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--lt-mist);
}

.page-about .about-codeno {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 26px;
  padding: 16px 18px;
  border: 2px dashed rgba(201, 162, 39, 0.5);
  background: rgba(5, 16, 12, 0.55);
}

.page-about .about-codeno__label {
  margin: 0 0 4px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--lt-mist);
}

.page-about .about-codeno__value {
  margin: 0;
  font-family: var(--lt-mono);
  font-size: 17px;
  letter-spacing: 0.06em;
  color: var(--lt-gold-soft);
}

.page-about .lt-copy {
  flex: none;
  padding: 9px 16px;
  border: 2px solid var(--lt-cyan);
  background: transparent;
  color: var(--lt-cyan);
  font-family: var(--lt-sans);
  font-size: 13px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 0.18s var(--lt-ease), color 0.18s var(--lt-ease);
}

.page-about .lt-copy:hover {
  background: var(--lt-cyan);
  color: var(--lt-black);
}

.page-about .lt-copy[data-copied] {
  border-color: var(--lt-gold-soft);
  color: var(--lt-gold-soft);
  background: transparent;
}

/* ---------- 里程碑 ---------- */

.page-about .about-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 22px 0 14px;
}

.page-about .lt-chip {
  padding: 6px 14px;
  border: 2px solid rgba(201, 162, 39, 0.5);
  border-radius: 999px;
  background: transparent;
  color: var(--lt-gold-soft);
  font-family: var(--lt-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color 0.18s var(--lt-ease), border-color 0.18s var(--lt-ease), color 0.18s var(--lt-ease);
}

.page-about .lt-chip:hover {
  border-color: var(--lt-cyan);
  color: var(--lt-cyan);
}

.page-about .lt-chip[aria-pressed="true"] {
  background: var(--lt-red);
  border-color: var(--lt-red);
  color: var(--lt-ivory);
}

.page-about .about-filters__count {
  margin: 0 0 18px;
  font-family: var(--lt-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--lt-mist);
}

.page-about .about-milestones {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-milestone {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px;
  border: 2px solid rgba(201, 162, 39, 0.4);
  background: linear-gradient(180deg, rgba(18, 46, 38, 0.92) 0%, rgba(11, 31, 26, 0.92) 100%);
  box-shadow: var(--lt-hard);
}

.page-about .about-milestone[hidden] {
  display: none;
}

.page-about .about-milestone__year {
  margin: 0;
  font-family: var(--lt-mono);
  font-size: 21px;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--lt-gold-soft);
}

.page-about .about-milestone__body h3 {
  margin: 0 0 8px;
  font-family: var(--lt-serif);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--lt-ivory);
}

.page-about .about-milestone__body p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--lt-mist);
}

/* ---------- 协作共建 ---------- */

.page-about .about-coop {
  display: grid;
  gap: 14px;
  margin: 22px 0 0;
}

.page-about .about-coop__item {
  padding: 17px 18px;
  border-left: 3px solid var(--lt-gold);
  background: rgba(18, 46, 38, 0.72);
  transition: border-color 0.18s var(--lt-ease), background-color 0.18s var(--lt-ease);
}

.page-about .about-coop__item:hover {
  border-left-color: var(--lt-cyan);
  background: rgba(18, 46, 38, 0.95);
}

.page-about .about-coop__item h3 {
  margin: 0 0 8px;
  font-family: var(--lt-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--lt-ivory);
}

.page-about .about-coop__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--lt-mist);
}

/* ---------- 服务时段 ---------- */

.page-about .about-service__grid {
  display: grid;
  gap: 26px;
  margin: 22px 0 0;
}

.page-about .about-service__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-service__list li {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(201, 162, 39, 0.22);
}

.page-about .about-service__list li:first-child {
  border-top: 1px solid rgba(201, 162, 39, 0.22);
}

.page-about .about-service__key {
  padding-top: 3px;
  font-family: var(--lt-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--lt-cyan);
}

.page-about .about-service__val {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--lt-mist);
}

.page-about .about-service__val strong {
  color: var(--lt-ivory);
  font-weight: 600;
}

/* ---------- 收束 ---------- */

.page-about .about-outro {
  display: grid;
  gap: 16px;
  margin-top: 32px;
  padding: 24px 20px;
  border: 2px solid var(--lt-gold);
  background: var(--lt-black);
  box-shadow: var(--lt-hard);
}

.page-about .about-outro p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--lt-ivory);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */

@media (min-width: 600px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-coop {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-chapter__body p {
    font-size: 15px;
  }
}

@media (min-width: 768px) {
  .page-about {
    padding-bottom: 96px;
  }

  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about h1 {
    font-size: 44px;
  }

  .page-about .lt-lede {
    font-size: 16px;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 26px;
  }

  .page-about .about-node {
    width: 34px;
    height: 34px;
    font-size: 12px;
  }

  .page-about .about-chapter__rail::before {
    top: 46px;
    bottom: -56px;
  }

  .page-about .about-chapter {
    padding-bottom: 58px;
  }

  .page-about .about-chapter__body h2 {
    font-size: 29px;
  }

  .page-about .about-outro {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 30px 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 58fr) minmax(0, 42fr);
    align-items: start;
    gap: 48px;
  }

  .page-about .about-hero__figure {
    margin-top: 58px;
  }

  .page-about .about-flow {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: start;
    gap: 38px;
  }

  .page-about .about-service__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
    align-items: center;
    gap: 40px;
  }
}

@media (min-width: 1100px) {
  .page-about h1 {
    font-size: 56px;
  }

  .page-about .about-chapter__body h2 {
    font-size: 34px;
  }

  .page-about .about-hero__grid {
    gap: 60px;
  }

  .page-about .about-milestone {
    grid-template-columns: 76px minmax(0, 1fr);
  }

  .page-about .about-milestone__year {
    font-size: 26px;
  }
}

@media (max-width: 560px) {
  .page-about .about-filters {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: none;
  }

  .page-about .about-filters::-webkit-scrollbar {
    display: none;
  }

  .page-about .about-filters .lt-chip {
    flex: none;
  }

  .page-about .about-milestone {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .page-about .about-codeno {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-role__mark,
  .page-about .lt-btn,
  .page-about .about-coop__item {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .lt-btn--primary:hover,
  .page-about .lt-btn--ghost:hover {
    transform: none;
  }
}